やったんじゃない

didn't do

→ 遣る
phrase Rare #30,583
didn't do A conversational way to deny that someone did something; literally, “it's not that [someone] did it.”
JA: 彼がやったんじゃないよ。
EN: He didn't do it.

私がやったんじゃない

I didn't do it.

— 動くな、死ね、甦れ! (1990)

俺がやったんじゃない

I didn't do it.

— ブレードランナー 2049 (2017)

わざとやったんじゃないんです。

I didn't do it on purpose.

トムは意図的にやったんじゃないと思うんだ。

I don't think Tom did it intentionally.